参数资料
| 型号： | ISL6236AIRZ-T |
| 厂商： | Intersil |
| 文件页数： | 20/37页 |
| 文件大小： | 0K |
| 描述： | IC MAIN PWR CTRLR QUAD 32-QFN |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 6,000 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 4 |
| 输出电压： | 多重 |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
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ISL6236A
addition, SMPS2 can also use REFIN2 to track its output from
0.5V to 2.50V. The ISL6236A contains fault-protection circuits
that monitor the main PWM outputs for undervoltage and
overvoltage conditions. A power-on sequence block controls
the power-up timing of the main PWMs and monitors the
outputs for undervoltage faults. The ISL6236A includes an
as measured by the VIN input and proportional to the output
voltage. This algorithm results in a nearly constant switching
frequency despite the lack of a fixed-frequency clock
generator. The benefit of a constant switching frequency is
that the frequency can be selected to avoid noise-sensitive
frequency regions, as shown in Equation 1:
t ON = ----------------------------------------------------------------------------------------------------------
adjustable low drop-out linear regulator. The bias generator
blocks include the linear regulator, 3.3V precision reference, 2V
precision reference and automatic bootstrap switchover circuit.
K ( V OUT + I LOAD ? r DS ( ON ) ( LOWERQ ) )
V IN
(EQ. 1)
The synchronous-switch gate drivers are directly powered
from PVCC, while the high-side switch gate drivers are
indirectly powered from PVCC through an external capacitor
and an internal Schottky diode boost circuit.
An automatic bootstrap circuit turns off the LDO linear
regulator and powers the device from BYP if LDOREFIN is
set to GND or VCC. See Table 1.
TABLE 1. LDO OUTPUT VOLTAGE TABLE
See Table 2 for approximate K- factors. Switching frequency
increases as a function of load current due to the increasing
drop across the synchronous rectifier, which causes a faster
inductor-current discharge ramp. On-times translate only
roughly to switching frequencies. The on-times established
in the “Electrical Specifications” table on page 4 are
influenced by switching delays in the external high-side
power MOSFET. Also, the dead-time effect increases the
effective on-time, reducing the switching frequency. It occurs
only in PWM mode (SKIP = VCC) and during dynamic output
LDO VOLTAGE
VOLTAGE at BYP
VOLTAGE at BYP
5V
CONDITIONS
LDOREFIN < 0.3V,
BYP > 4.63V
LDOREFIN > VCC - 1V,
BYP > 3V
LDOREFIN < 0.3V,
COMMENT
Internal LDO is
disabled.
Internal LDO is
disabled.
Internal LDO is
voltage transitions when the inductor current reverses at
light or negative load currents. With reversed inductor
current, the inductor's EMF causes PHASE to go high earlier
than normal, extending the on-time by a period equal to the
UGATE-rising dead time.
TABLE 2. APPROXIMATE K-FACTOR ERRORS
BYP < 4.63V
active.
SWITCHING
APPROXIMATE
3.3V
LDOREFIN > VCC - 1V,
Internal LDO is
FREQUENCY K-FACTOR
K-FACTOR
BYP < 3V
active.
SMPS
(kHz)
(μs)
ERROR (%)
2 x LDOREFIN
0.35V < LDOREFIN < 2.25V
Internal LDO is
active.
(t ON = GND, REF,
or OPEN), VOUT1
400
2.5
±10
FREE-RUNNING, CONSTANT ON-TIME PWM
CONTROLLER WITH INPUT FEED-FORWARD
(t ON = GND),
VOUT2
(t ON = VCC),
500
200
2.0
5.0
±10
±10
The constant on-time PWM control architecture is a
VOUT1
pseudo-fixed-frequency, constant on-time, current-mode
type with voltage feed forward. The constant on-time PWM
(t ON = VCC, REF,
or OPEN), VOUT2
300
3.3
±10
control architecture relies on the output ripple voltage to
V OUT + V DROP1
t ON ( V IN + V DROP2 )
provide the PWM ramp signal; thus the output filter
capacitor's ESR acts as a current-feedback resistor. The
high-side switch on-time is determined by a one-shot whose
period is inversely proportional to input voltage and directly
proportional to output voltage. Another one-shot sets a
minimum off-time (300ns typ). The on-time one-shot triggers
when the following conditions are met: the error comparator's
output is high, the synchronous rectifier current is below the
current-limit threshold, and the minimum off time one-shot
has timed out. The controller utilizes the valley point of the
output ripple to regulate and determine the off-time.
ON-TIME ONE-SHOT (t ON )
Each PWM core includes a one-shot that sets the high-side
switch on-time for each controller. Each fast, low-jitter,
adjustable one-shot includes circuitry that varies the on-time
in response to battery and output voltage. The high-side
switch on-time is inversely proportional to the battery voltage
20
For loads above the critical conduction point, the actual
switching frequency is:
f = ------------------------------------------------------- (EQ. 2)
where:
? V DROP1 is the sum of the parasitic voltage drops in the
inductor discharge path, including synchronous rectifier,
inductor and PC board resistances
? V DROP2 is the sum of the parasitic voltage drops in the
charging path, including high-side switch, inductor and PC
board resistances
? t ON is the on-time calculated by the ISL6236A
FN6453.3
March 18, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6236EVAL1 | 功能描述:EVAL BOARD 1 FOR ISL6236 RoHS:否 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:* 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ISL6236EVAL2 | 功能描述:EVAL BOARD 2 FOR ISL6236 RoHS:否 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:* 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ISL6236IRZA | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers |
| ISL6236IRZAR5281 | 功能描述:IC MAIN PWR CTRLR QUAD 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6236IRZA-T | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers |
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